Pollution from vehicles is one of the major causes of climate change. A study by the Union of Concerned Scientists showed that in total, the transportation sector in the United States accounted for over 30 percent of all United States global warming emissions. Internationally, these numbers are often higher, especially in countries lacking strong environmental regulation. A study by NASA’s Goddard Institute for Space Studies suggests that emissions from the transportation sector will be the main driver of global warming over the next half-century. Despite a host of emissions-reducing solutions in the form of alternative fuels and advanced vehicle technology, the [...]